Method and apparatus for forming a can end with minimal warping

Details Method and apparatus for forming a can end with minimal warping Method and apparatus for forming a can end with minimal warping

B - Operations, Transporting

21

D

B21D 51/38 (2006.01)

Patent

CA 2409045

A method of forming a can end (10) comprises the step of forming a substantially circular metal blank having a periphery and a centre panel (16). An annular recessed panel (30) is subsequently formed in the blank. The recessed panel has a first depth relative to a substantially annular portion (28) of the blank contiguously formed with the recessed panel. The substantially annular portion of the blank is then coined while the recessed panel is re-formed to a second depth relative to the substantially annular portion of the blank. The second depth is greater than the first depth. Forming the can end in this manner minimises warping of the can end, and thereby allows the can end to be formed from a relatively thin sheet of metal.

Ce procédé de formation d'une extrémité (10) de boîte en métal comprend l'étape consistant à former un flan métallique circulaire possédant un pourtour et un panneau central (16), à former ensuite un panneau annulaire en retrait (30) qui possède une première profondeur par rapport à la portion (28) sensiblement annulaire du flan, formée de manière contiguë au panneau en retrait, puis à estamper la portion sensiblement annulaire, tandis que l'on forme à nouveau le panneau en retrait pour qu'il se situe à une seconde profondeur par rapport à la portion sensiblement annulaire du flan, cette seconde profondeur étant supérieure à la première. Le fait de former cette extrémité de boîte en métal de cette manière minimise le gauchissement de l'extrémité et permet de former cette extrémité à partir d'une feuille de métal relativement mince.

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